code: def __init__(
      self, existing_node: LeafNode, updated_node: DecisionNode
  ):
      if type(existing_node) != LeafNode:
          raise TypeError("Can only grow Leaf nodes")
      super().__init__("grow", existing_node, updated_node)
  
file_path: imodels/imodels/experimental/bartpy/mutation.py
imports: from .node import TreeNode, DecisionNode, LeafNode
label_desc: Use image node_id 1 to create a new GrowMutation object from inherited base classes: TreeMutation with example: obj = GrowMutation(existing_node, updated_node)